ejiki: But steam in general isn't DRM. Steam
contains DRM, most of games uses this DRM, but not all. Game can fully support steam social features, but if you are able to start game
without steam - it's still DRM-free.
I'm pretty sure most games don't use the DRM feature of Steam. Most games do use the Steam features which require Steam to be running, but it's not as much from wanting DRM but wanting to provide these features. It's not too hard to detect that Steam is not running and enable to run the game without these features.
Problem is, a lot of developers and consumers aren't aware of it, but it seems to me that anti-DRM consumers who know about it prefer that others won't be, because they hate Steam, so would rather shout "Steam is DRM" in the hope of convincing people not to use it than have DRM-free games on it.